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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeaff9414367c6f30ee75514cac4702d2a4d17b15866d04156ffc2f56fea6779' 
  AND token = '1aeUau5XOF6U4HvFhsmUgoI7Gyz15tIIYku6nt4JGvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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