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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f398d7916d12b5302fec6096d5e11838d4e8cf2cb8be720140b434dfbd67a9cd' 
  AND token = 'w17O92qZ4LBOGagzAREoNWesbIHaH38c9Jge4xscapc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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