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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b63232ef2d56e5a9f28282a833264d388b5dfaeb4027247a1b1b221144561cd' 
  AND token = 'HtTfDIn3j/6HtiuddrBgvBH2ddry6OSaYRrisGYgh/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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