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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86be69749238e5b07361d126aa201dcb49ee72c9e7cfa1c160739a4d7818991' 
  AND token = 'VPaogeamgUOnisM1eeZZJg7m+ljk3kgKot1LawiTm9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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