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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb5d9d241f700b167033d4c4fb2a1436151ba3368e079afaa78462eaa65017d' 
  AND token = 'WzHSWCvu8Dq0oFOvQtuYKntvB4e39Ne0To300OTVUEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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