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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00732a85ea06207098b22d65bde6c3c0e854f4ea7661416a389e9f915cd1839b' 
  AND token = 'hf7vnHlfmSIWorL0iz+O3moA7weTUVjHlaVpaVPcUoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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