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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf30804d4b5c2d2775d850b8ac0c10e75a33767b31ae7f8e7e1fb23ef284b865' 
  AND token = 'nN1i6lW3JAI+3aBqGuA9ab6cYSZ+tyWvA8rCLq6xegg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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