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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf5e99abc02dfa9f788ade7afe74b9bd62188dc6099913ee200bc30dae225c8' 
  AND token = 'gug4HffZok62ItMe5SVyMAybvk7l7ivcoqXSkcioFIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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