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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a22f08001465be9eb1a9b06f993ad9aa758807a55e7c05be1b3eb92f2bb22d84' 
  AND token = 'LHFCBCJRnuD3jFs8Kah58aI+4ggLAQ/pR6z4wbfCCIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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