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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031ae85c0bf2945d14c5859a3e4d71a1c41e7b9c0d07c2856933a629ac818492' 
  AND token = 'oZqvhfsGmL5nWiv7TfreGgRI9zdioWtczoExD/G+3hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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