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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ab381f1af4c40d8f5af91845a2e3b9d4215969d2890ce4cb40db99db99f5cb' 
  AND token = 'pVzeioyi/h3Kjot1Xjpohf2Nq69dQW/0vbMtldimrlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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