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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086d5d7670eef7ce6b1692f24df27091895e74d47ecaf2d5a8a67277b2f9f661' 
  AND token = 'Tt/53z1xG2naaT9w9I2/9doEeRqtXYllpddAaVy2+44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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