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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2cfe0f7c73d8df5820e8123e4d4c1b57c5b40de16fb97006e6e3388294fb0b' 
  AND token = '0gZR7M13keY25a1kjyWv6o1O1KhjsSsqnNIYMaj5Ir4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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