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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235ab62fc06a1f3b6086e31a0628505ec98de3f70cf9fad77ec085d80c710fe6' 
  AND token = 'wu3pWgI7bk92oMVeiMnNLXRXSSKr/OLh88bGcEMobjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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