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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa51a5ee82f1e82cdc1ce8eef02b90ba60bb67f2be0186c7a7781ae1d64ea2e' 
  AND token = 'kSfmtQDGaiTPdBRCKRA9neTldcAgilbwrOUAnFqMZO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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