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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04731993518c16bd88b8f961e27e6cd046823dd21dd39a48ed72fd6fc579f82' 
  AND token = '/HMW/XPJJW5paxC74ki7wiT7xVxl3TGaH6QFzlmcfJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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