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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50bd0dffc8ce45b6b1af55acc3df1ed997ee47da9e6f802b18b038f12c7376f' 
  AND token = 'FVg0kK84K7HQfSb1cWw6FgJYJ8VQCbPjql5+H2e/CXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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