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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c580a2ac8da973bba007e613a6f4002218a9d04e2633338b5c9b7b176782518' 
  AND token = 'HLw9Gx5fzYWL17RhW9L6NDMQ8rDSp8LatRmZsWMPpkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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