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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af185656d4e4a273a0eb568c589bfa265337b688328c5ace3dc121b7f119753' 
  AND token = 'a0zVqAbBZFDo1BPKWJssVn381pSzFVwd45j6fsJRtoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00186

JSON explain

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