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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92556a00e6252c103b0a8f1ffdfd179bb0c8000057a109df0f48bd6b3c40c617' 
  AND token = 'x5d/lOX9lOPr6EX0idHQnU5Q/qRRwxfgmOO9ufe2Rtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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