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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cb6d6af246d8c9ae57894da3f3e7105b85ff665e5014ba06ecbbb0bd4ed30e' 
  AND token = 'MI4s81+6lIU72Y+5tpagAT6FuoeRWebcfWOEKvthGIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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