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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4a1dfd3fb12e79548d4f9f909ff296b448b1423300e7ffd4454648e3080451' 
  AND token = '9mjZCSwcWIMfwKFbti46CiW1kDS1FIMYEjpNPjEdS1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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