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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd5eaa839e3f52bb160faacd7207702566081184460bd91bf82ac1befee0ff2' 
  AND token = '34HUgFXDW041IdDNULUOwoujccl4C7Aew3+Ogb93fmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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