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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d55cc33469170f30bbd87f5d01819a9cb407b8c391564586324589cf9980d1e' 
  AND token = 'ujyk7X7WIQmo140Def4XPVxk2EHnmY737ytSx8Vz+sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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