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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f84a83f8a69b09a5f5d37f03e801f62c7c67d0d5f4eeb9a58c39ef34e0bda1' 
  AND token = 'oukOwer4xBWr5WP8+SlIFz/BsgB63vwfmXj21kqP2ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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