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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a34d1a93e13add31d70421dbc27eafae4f36c0e55af99f67c071b96126adf5' 
  AND token = 'eybycZeq2Qf+g0aQ7qNh/5xos27Gimi8QgoN2bGON2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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