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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771022f807fce57615ab4077725cc7082dc733ca6e69ec72a594e15bd62028f1' 
  AND token = 'Cib2P35FTzVAB/gzbLdgew7t79Q/Fe+rErUrm/loj6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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