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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d90c06877843adc50524fd61a8b572dd84558825aa8d9333ef70d9a7aa8cd9d' 
  AND token = 'Su+YF+Nb6Xi2Sjz+RBvSdznA2EgTgern9ZyvKvjZVpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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