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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2565e71cdbf4b2e6feaeeb5eaad5fe71bfb5489e7b3b69cad68299227f8e63' 
  AND token = 'IiJnluU93ZBkIQDQ1hMR/nnId2UEP9bquUncJrvoE+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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