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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e064f6388c2090e7a99fd974dc23de252aaf7b28813b1c20de4f965267ac1a9' 
  AND token = 'Fx2k3qRrt9YhKgU7Rylfz0ocr5/sWKGF78+oPCXS354=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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