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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64fb083cc806be550864a7a1fa969bfb22cb883f75fc01717d05729c33367e7' 
  AND token = 'yupTtQt6AJq4nSLlELd/UNYtAZdmgz3nzwUak8sUaPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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