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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cb9594bf82e183e10ca7747fc6dacbccd97e3cb389bedbc453a5c28be7881e' 
  AND token = 'pX8CqT5kjhCQDsSmfev9ZsyncpfvNqsBV4T2oU4qZag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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