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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5779e1e130daab337febfee92ef97dc97cfefded42a2e7c26e53699d1ea204ec' 
  AND token = '8Zl8aypcoWqVvDi2YnFbQ9NSrHYejCz2rLoZjZ+/9rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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