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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25e668fb0ccac6e9cf873bd17839060dead32573c3eddd5ebdcff8408867f26' 
  AND token = 'Mx4v//Eg54NxamefbAdWoHVL4ar3IfDJ4OPgG7/88/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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