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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310d5c0b46db8e874e3109e3ad75de657d3e90654a0764e3f148b58d238070bf' 
  AND token = 'WO98rqf6pdgWfjM6ivSFDRXOl8NvsiX+7qxZ9xb9toY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}