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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57c0746313ed24df014f2595d403c615564947b841d10c9f2d43087588ba7c1' 
  AND token = 'xzGyuLkhYN1G3A7oJ5fRZX1w1D6k6Ng6ZlD0fJzJd3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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