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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653e78f9ee36bd8b6c4bfa643eacea2ebefdc00d31e3577467e195fd507562e5' 
  AND token = 'en7v7kxxe7PdFuyW5jNqakx1NAowKu42DUKKBuLP4eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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