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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292681f6ee7fc35e9c21a46faed2a03458c9435260b2dc8f179fc2611220a2bf' 
  AND token = 'yq9ez9mHuxsSrAFahxYQPBjeHflpM1SyVNvJg+rRoI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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