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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bded8b994c4ce2cc1b20b64f842cb56deb2decf50f9f77300b9702547a6f0b' 
  AND token = 'xv+TnlGs6LOR7iqCtYuwqtPOs4CrWzralRPeiCgOB/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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