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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce17b97083d4faee12ed39bfa5491eb67f2f4f00c2a18c21c7135f0a00141014' 
  AND token = 'kj2YW6dIRR2dC0L+LrZF+yyltx6BFGk60SYPJorUx7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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