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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834cb2bf87556aec88da1568979b68687180968b29a6c8eb659c0caec41d68da' 
  AND token = 'zpwRZDIkD0fLndlT5vjPdkDQlw1p6m8NePWm314KvZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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