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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab97e7a53dd0766185e369acd1fb6fa7e4e609f573a4371b467991a10bd241e' 
  AND token = 'kEW857Lzu2wo5JGIxxTjj3gwHglqe9k346Nrip1NQA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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