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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6439fa58d7652fee714fff6ec0ff70f87d2b3b7144bcfd87d79f16400e89ff5' 
  AND token = 'qdtBjN4fKTDpmM770AN6LCv+4xiPalFrF82CHzJqxHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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