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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e30a0f048583f14af7dbeae8a55d6336d186ce1211a92a7d626ac4331e90840' 
  AND token = 'km7ya1f7w469BC1bcbO1SB4kpjl/q8PSKqP7nx+kNcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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