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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b68ede73ce41e638cb8b5a1160ef6597e11d98aa0fc98ec8b9dc1113f5c03ce' 
  AND token = 'NpwQ4XVbSfZbOElldoLGjxJ2i6Q1qDRhJpjeANjHOF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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