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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a184476bf49672d67c11fc2878f18b9ae31358b628cdc4d2aeedd65c66d9513f' 
  AND token = 'COK2RW45x9Hh8fhqonrIpSjn753fBcdv/dsPGsBKsAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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